I use IrfanView (Freeware) for screenshots. It allows a great range of how-to-do.
I can press CTRL+F11 (keys can be adjusted) to make one or use the time feature = makes a screenshot every XX seconds.
You can adjust several things like output format ,quality ,screen size ,save path ...
Additionly IrfanView can be used for literally thousends of tasks. And it is the fastest viewer I ever seen. ...and I`ve seen a million softs since the mid 80`.